/*
 * Copyright 2019-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.data.repository.kotlin

import io.mockk.every
import io.mockk.mockk
import io.mockk.verify
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flowOf
import kotlinx.coroutines.flow.toList
import kotlinx.coroutines.runBlocking
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.mockito.ArgumentCaptor
import org.mockito.Mockito
import org.reactivestreams.Publisher
import org.springframework.data.repository.core.support.DummyReactiveRepositoryFactory
import org.springframework.data.repository.core.support.RepositoryMethodInvocationListener
import org.springframework.data.repository.reactive.ReactiveCrudRepository
import org.springframework.data.repository.sample.User
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import rx.Observable
import rx.Single

/**
 * Unit tests for Coroutine repositories.
 *
 * @author Mark Paluch
 */
class CoroutineCrudRepositoryUnitTests {

	val backingRepository = mockk<ReactiveCrudRepository<User, String>>()
	lateinit var factory: DummyReactiveRepositoryFactory
	lateinit var coRepository: MyCoRepository
	lateinit var invocationListener: RepositoryMethodInvocationListener

	@BeforeEach
	fun before() {
		factory = DummyReactiveRepositoryFactory(backingRepository)
		invocationListener = Mockito.mock(RepositoryMethodInvocationListener::class.java)
		factory.addInvocationListener(invocationListener)
		coRepository = factory.getRepository(MyCoRepository::class.java)
	}

	@Test // DATACMNS-1508, DATACMNS-1764
	fun shouldInvokeFindAll() {

		val sample = User()

		every { backingRepository.findAll() } returns Flux.just(sample)

		val result = runBlocking {
			coRepository.findAll().toList()
		}

		assertThat(result).hasSize(1).containsOnly(sample)
		Mockito.verify(invocationListener).afterInvocation(Mockito.any())
	}

	@Test // DATACMNS-1508
	fun shouldInvokeFindAllById() {

		every { backingRepository.findAllById(any<Publisher<String>>()) } returns Flux.fromArray(arrayOf(User(), User()))

		val result = runBlocking {
			coRepository.findAllById(flowOf("user-1", "user-2")).toList()
		}

		assertThat(result).hasSize(2)
	}

	@Test // DATACMNS-1508
	fun shouldInvokeSaveAllWhenGivenIterable() {

		val sample = listOf(User(), User())

		every { backingRepository.saveAll(any<Iterable<User>>()) } returns Flux.fromIterable(sample)

		val result = runBlocking {
			coRepository.saveAll(sample).toList()
		}

		assertThat(result).containsExactlyElementsOf(sample)
	}

	@Test // DATACMNS-1508
	fun shouldInvokeSaveAllWhenGivenFlow() {

		val u1 = User()
		val u2 = User()
		val sample = flowOf(u1, u2)

		every { backingRepository.saveAll(any<Publisher<User>>()) } returns Flux.fromArray(arrayOf(u1, u2))

		val result = runBlocking {
			coRepository.saveAll(sample).toList()
		}

		assertThat(result).containsExactly(u1, u2)
	}

	@Test // DATACMNS-1508
	fun shouldInvokeFindById() {

		val sample = User()

		every { backingRepository.findById("foo") } returns Mono.just(sample)

		val result = runBlocking {
			coRepository.findById("foo")
		}

		assertThat(result).isNotNull().isEqualTo(sample)
	}

	@Test // DATACMNS-1508
	fun shouldInvokeExistsById() {

		every { backingRepository.existsById("foo") } returns Mono.just(true)

		val result = runBlocking {
			coRepository.existsById("foo")
		}

		assertThat(result).isTrue()
	}

	@Test // DATACMNS-800
	fun shouldInvokeDeleteAllById() {

		every { backingRepository.deleteAllById(listOf("foo", "bar")) } returns Mono.empty()

		runBlocking {
			coRepository.deleteAllById(listOf("foo", "bar"))
		}

		verify { backingRepository.deleteAllById(listOf("foo", "bar")) }
	}

	@Test // DATACMNS-1508
	fun shouldInvokeDeleteAll() {

		every { backingRepository.deleteAll() } returns Mono.empty()

		runBlocking {
			coRepository.deleteAll()
		}

		verify { backingRepository.deleteAll() }
	}

	@Test // DATACMNS-1508
	fun shouldInvokeDeleteAllWhenGivenIterable() {

		val sample = listOf(User(), User())

		every { backingRepository.deleteAll(any<Iterable<User>>()) } returns Mono.empty()

		runBlocking {
			coRepository.deleteAll(sample)
		}

		verify { backingRepository.deleteAll(sample) }
	}

	@Test // DATACMNS-1508
	fun shouldInvokeDeleteAllWhenGivenFlow() {

		val u1 = User()
		val u2 = User()
		val sample = flowOf(u1, u2)

		every { backingRepository.deleteAll(any<Publisher<User>>()) } returns Mono.empty()

		runBlocking {
			coRepository.deleteAll(sample)
		}

		verify { backingRepository.deleteAll(any<Publisher<User>>()) }
	}

	@Test // DATACMNS-1508, DATACMNS-1764
	fun shouldBridgeQueryMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo", null))).thenReturn(Mono.just(sample))

		val result = runBlocking {
			coRepository.findOne("foo")
		}

		assertThat(result).isNotNull().isEqualTo(sample)
		val captor = ArgumentCaptor.forClass(RepositoryMethodInvocationListener.RepositoryMethodInvocation::class.java)
		Mockito.verify(invocationListener).afterInvocation(captor.capture())
	}

	@Test // DATACMNS-1508
	fun shouldBridgeRxJavaQueryMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo", null))).thenReturn(Single.just(sample))

		val result = runBlocking {
			coRepository.findOne("foo")
		}

		assertThat(result).isNotNull().isEqualTo(sample)
	}

	@Test // DATACMNS-1508
	fun shouldBridgeFlowMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo"))).thenReturn(Flux.just(sample), Flux.empty<User>())

		val result = runBlocking {
			coRepository.findMultiple("foo").toList()
		}

		assertThat(result).hasSize(1).containsOnly(sample)

		val emptyResult = runBlocking {
			coRepository.findMultiple("foo").toList()
		}

		assertThat(emptyResult).isEmpty()
	}

	@Test // DATACMNS-1508
	fun shouldBridgeRxJavaToFlowMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo"))).thenReturn(Observable.just(sample))

		val result = runBlocking {
			coRepository.findMultiple("foo").toList()
		}

		assertThat(result).hasSize(1).containsOnly(sample)
	}

	@Test // DATACMNS-1508
	fun shouldBridgeSuspendedFlowMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo", null))).thenReturn(Flux.just(sample), Flux.empty<User>())

		val result = runBlocking {
			coRepository.findSuspendedMultiple("foo").toList()
		}

		assertThat(result).hasSize(1).containsOnly(sample)

		val emptyResult = runBlocking {
			coRepository.findSuspendedMultiple("foo").toList()
		}

		assertThat(emptyResult).isEmpty()
	}

	@Test // DATACMNS-1802
	fun shouldBridgeSuspendedAsListMethod() {

		val sample = User()

		Mockito.`when`(factory.queryOne.execute(arrayOf("foo", null))).thenReturn(Flux.just(sample), Flux.empty<User>())

		val result = runBlocking {
			coRepository.findSuspendedAsList("foo")
		}

		assertThat(result).hasSize(1).containsOnly(sample)

		val emptyResult = runBlocking {
			coRepository.findSuspendedAsList("foo")
		}

		assertThat(emptyResult).isEmpty()
	}

	interface MyCoRepository : CoroutineCrudRepository<User, String> {

		suspend fun findOne(id: String): User

		fun findMultiple(id: String): Flow<User>

		suspend fun findSuspendedMultiple(id: String): Flow<User>

		suspend fun findSuspendedAsList(id: String): List<User>
	}
}
